Collet stop



FIG. 1 is a perspective view of a collet stop showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevation view thereof; and

FIG. 5 is a sectional view thereof taken in direction of arrows 5--5 ofFIG. 3.

The ornamental design for a collet stop, substantially as shown anddescribed.